police eventually arrested john allen muhammad and lee boyd malvo for those shootings. they were later convicted. muhammad was executed in 2009. malvo, who was a teenager at the time of the shootings, is currently serving a life sentence without the possibility of parole. >>> police are looking for a guy going around groping american university students. the latest incident happened on sunday night on massachusetts avenue. police say the suspect comes from behind, grabs girls inappropriately, and then runs away. this happened four times in just the last week. >> luckily, the university, if i feel uncomfortable, i can always call public safety, and they'll escort me to my apartment. so i guess i might be taking advantage of that service more often now with things like this happening. >> the university is telling students to walk in groups and only in well lit areas. they also are asking students to keep their cell phones handy in case they need to call for help. >>> president obama and mitt romney will keep low profiles today as they prepare for their first debate. romne